{\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\hline\hline
&\textbf{Group 1}&\textbf{Group 2}&\textbf{Diff.} &\textbf{p-val}\\
& (1) & (2) & (3) & (4)\\
\hline
Gender (1 = Male, 2 = Female) &  34.04 &  32.14 &   1.89 &   0.00 \\
& (8.26) & (8.41) & & \\
Country (1 = US, 2 = India) &  32.08 &  34.80 &  -2.72 &   0.00 \\
& (8.56) & (9.44) & & \\
Age (1 = Under 33, 2 = Over 33) &  33.41 &  31.57 &   1.84 &   0.00 \\
& (8.97) & (9.00) & & \\
\hline\hline
\end{tabular}}
